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Oroville Dam spillway taking shape in this September 11 flyover

Fly right up the spillway at Lake Oroville as repairs continue during the week of September 11, 2017. In February, water flowing down the main Oroville Dam spillway during raging winter storms ripped a huge hole in that concrete structure.

Oroville Dam spillway taking shape in this September 11 flyover

Sep 12, 2017

Fly right up the spillway at Lake Oroville as repairs continue during the week of September 11, 2017. In February, water flowing down the main Oroville Dam spillway during raging winter storms ripped a huge hole in that concrete structure.

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Oroville Dam spillway taking shape in this September 11 flyover

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Fly right up the Oroville Dam spillway to see how repairs are shaping up

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Fly down the Oroville dam spillway as repair work continues in early August

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This September 25, 2017 video shows progress on the Oroville Dam spillway. In February, the spillway at the nation's tallest dam was damaged, placing tens of thousands of people in the Butte County community of Oroville under evacuation orders due to the threat of flooding. The crisis began after heavy rain from one of the wettest winters on record.

Repairs continue at Oroville Dam. Anchors are placed, side walls are framed, and the first structural slab erected on the upper spillway. On February 7, 2017, dam operators released a gusher of water down the spillway to reduce water levels at Lake Oroville. The heavy flows coming down the spillway apparently exploited weak points in the concrete, and one section of the concrete chute was lifted up, creating a giant crater underneath. The spillway is now under repair in a race to finish before the next rainy season.

Oroville Dam spillway construction is progressing at a fast pace, according to the Department of Water Resources, as large volumes of concrete are placed in multiple areas of the flood control spillway throughout the day. The large void in the central area of the chute, shown in this video posted Sept. 2, 2017, is being filled with roller-compacted concrete, while leveling concrete is poured in the upper chute.

Crews working to repair the Oroville Dan spillways worked this week placing roller-compacted concrete in between the upper and lower chutes of the Lake Oroville flood control spillway. Workers also put forms in place to begin pouring concrete for spillway walls soon.

Steel beams are installed for the upper spillway walls at Oroville Dam during the week of August 22, 2017 in this video showing progress of the repair work. Roller-compacted concrete continues going in on the middle spillway. Crews also prepare the area between the upper and lower chute for the concrete by filling the crevasses with dental concrete. Rebar mats are set for structural concrete on the lower spillway.

The U.S. Army Corps of Engineers and the U.S. Bureau of Reclamation have almost completed the Folsom Dam auxillary spillway project designed to reduce the flood risk for the Sacramento region. Here's the progress from 2008 to 2017, from excavation to construction. The scheduled completion is for 2017.

As work continues on the Lake Oroville Dam spillways (Aug. 8, 2017), concrete is poured into 30- to 80-foot holes to create the underground cut-off wall downslope of the emergency spillway. Crews continue to assemble and erect electrical towers to reroute power lines away from the spillway. Rebar is installed for the upper spillway walls and structural concrete, concrete is poured and graded, and more stay-forms are installed.

Kiewit continues to pour roller compacted concrete in the void near the lower spillway and conventional concrete to prepare the spillway's foundation, part of the Lake Oroville spillways recovery project.

In an Aug. 1, 2017, update by the Department of Water Resources, video shows construction continuing on the lower spillway at the Lake Oroville dam. Crews are building forms and installing drains. A rotary drilling machine begins to expand the holes for the emergency spillway cutoff wall. Concrete goes in on the upper spillway and Kiewit Corp. works through the night.

Working under lights in the week of July 27, 2017, work crews at Oroville Dam begin to fill erosion areas in the middle of the main spillway with roller-compacted concrete. Oroville’s crisis began when a giant crater opened in the main spillway Feb. 7, 2017.

In this video, electrical towers are removed for relocation and installation begins on drainage pipes for the lower spillway at the Oroville Dam in Butte County. The near-collapse of the spillway at Lake Oroville earlier this year led to efforts to repair and improve the facility.

Kiewit Corp. begins pouring concrete on the upper spillway and continues rock cleaning to prepare the spillway's foundation, part of the Lake Oroville spillways recovery project, in this July 20, 2017, video.

Recovery efforts continue on the Lake Oroville spillways project, with concrete being placed on the lower chute of the main spillway, and excavation and rock cleaning to prepare the spillway's foundation, July 18, 2017.